You're gonna open up a can of worms here, but I'll play.
AR - based on what I interpret your requirements to be, Colt LE 6920 hands down...simple, basic, reliable, solid, proven. If your not looking for a platform to trick out with every f'ing AR option known to man and just want a badass no frills rifle, then this is the goto gun. Wait until one of the big online shops put them on sale (which is happening more and more frequently now) and buy all you can afford.
Pistol - I agree with Nolen on the 357 Sig...that's a fantastic round, but not very practical in terms of availability. I am, however, a big fan of .45 ACP. In full frame (perhaps not as tactical as you're looking for) they do not kick at all. You can literally shoot a Glock 21 all damn day. 9mm is a lot better these days than it used to be. There are a lot of hot 9mm rounds you can shoot and a lot of tactical platforms to shoot it from. I've said it before in this thread and I'll say it again...one can never go wrong with a Sig P226 (any flavor) in 9mm. It's full frame too, but, like the 6920, it'll never let you down.